multiple management interfaces on the SZ100

I have an SP customer who wants to provide a managed service to their customers using the SZ100 platform.They require a separate management address for their own use to manage the SZ100 remotely.Scenario:10.1.1.0 network for AP control and management using their clients' internal network172.16.12.0 network for access from outside the clients network for remote management

I tried configuring a user defined interface on 172.16.12.10, but it does not work. The user defined interfaces do not accept gateway addresses. Is there a solution for this?

I think you need to configure the site FW to port forward the desired external IP to the SZ100's 10.1.1.x IP address.Note, their 172.16.x.x is RFC-1918 non-routable so it must traverse the SP backbone.